Potomac Nature Walk Mystery Cache
swansont: The cache location is a little too exposed, and I fear it will just get muggled again after too long.
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Difficulty:
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Terrain:
-
Size: 
(regular)
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Cache NOT at listed coordinates!
This cache will require that you take a walk around Potomac Overlook Regional Park and gather clues from the signs on the Nature Trail and other signs nearby to figure out the cache location. All signs are located on the main entrance road or green trail.
Cache contains various nature-related goodies. Please try and go along with this theme.
For final coordinates, take the original listed coordinates and make the following calculations to the decimal minutes:
Latitude (690)
+ (the year the spring collapsed)
- (the year the red oak was downed)
+ (millions of years ago trilobites went extinct) (number from near the "ripple rock")
- (how hot the solar water heater can preheat the water: from 80F to ? )
Longitude (411)
+ (The year George Mason IV divided his estate between his three sons)
- (the year by which there were no Indians left in Arlington)
+ (the larger size, in inches, a catalpa leaf can grow)
- (millions of years ago the Cenezoic era started)
checksum: last three digits should add to 11 for both lat & long
Cache does not require any bushwhacking
Additional Hints
(No hints available.)
Treasures
You'll collect a digital Treasure from one of these collections when you find and log this geocache:
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